A sept known as the Clan Chuain of Ui Fiachrach (Sligo and north Mayo). During the twelfth century they transferred their allegiance to Mac Diarmada (MacDermott) of Moylurg.

1640 Civil Survey

O'Quinn was to be found in

1659 Census

Quinn/e was to be found in the baronies of

1830 Tithe Books

Quin/Quin was to be found in all baronies

1848/49 Griffiths Valuation

Quinn/Quinn was widely distributed in the county, the greatest concentrationwas in the Barony of Rathdown with 29 households.

1890 Birth Index

The principal surnames is listed, they are in order of the numerical strength in which they occur. The figure after the surname is the number of entries in the birth index for 1890. The estimated number of persons of each surname can be ascertained by multiplying the figure by the average birth rate, which for that year was 1 in 44.8 persons.

Walsh 134, Gallagher 92, Kelly 89, Malley 78, Moran 77, Duffy 55, McHale 50, Gibbons 47, Joyce 46, Connor 45, Conway 40, Higgins 39, Murphy 39, Burke 36, Reilly 36, Durkan 35, Doherty 34, McHugh 34, Sweeney 33, Lyons 32.